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Face Fill mode ignores selected UDIM #2081

Description

@LuxStice

ArmorPaint version:
1.0a 44ce84e

OS / GPU model:
Fedora 44 Plasma
RX6570XT : Vulkan RADV

Issue description:
When multiple UDIM textures present, if using the bucket tool on Face mode, it paints UDIM textures on that location. As visible on the screenshots, I wanted to paint just that little beveled strip, but it paints both the face that I want and the 2nd UDIM face at that same position.
From the UVMap's wireframe on the 2nd and 3nd screenshot you can see how both polygons are in the position that I clicked in.
Happens both on viewport and the 2D view.

Image Image Image

Steps to reproduce:

  1. Get a shared UDIM mesh (example.zip) and import into armor paint
  2. add a mask layer with distiguishable a material
  3. select the bucket/fill tool
  4. select the Face Fill Mode
  5. Try to paint a face exclusively on one of the UDIMs

It will paint both faces that are located wherever you clicked

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